• Title, Summary, Keyword: sulfur

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Influence of Sulfur Fertilization on the Antioxidant Activities of Onion Juices Prepared by Thermal Treatment

  • Koh, Eunmi;Surh, Jeonghee
    • Preventive Nutrition and Food Science
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    • v.21 no.2
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    • pp.160-164
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    • 2016
  • Two onions (Sulfur-1 and Sulfur-4) cultivated with different sulfur applications were thermally processed to elucidate the effects of heat treatment on browning index and antioxidant activity. Sulfur-4 onion had higher sulfur content compared with the Sulfur-1 onion. After thermal processing, browning intensity was different between the two onions juices, with lower values observed for Sulfur-4 onion juice. This suggests that sulfur inhibits the Maillard browning reaction. The total reducing capacity of the juices increased at higher thermal processing temperatures; however, it was also lower in the Sulfur-4 onion juice. This suggests that the heat treatment of onions enhanced their antioxidant activity, but the effect was offset in the Sulfur-4 onion juice presumably due to higher sulfur content. This study indicates that sulfur, a core element for the functionality of onions, can decrease the antioxidant activity of thermally processed onions because of its potential as a Maillard reaction inhibitor.

Studies on the Polarographic Behavior of Elemental Sulfur (원소 유황의 Polarograph 거동에 관한 연구)

  • 김준용;장순자
    • YAKHAK HOEJI
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    • v.22 no.4
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    • pp.201-206
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    • 1978
  • The analysis of elemental sulfur by polarography has already been reported in the literature. Only a discussion of the more important factors influencing the analysis is here presented. (1) The effects of pH on the reduction of elemental sulfur are pronounced and the use of buffered solutions for the analysis of elemental sulfur is necessary. The authors found that a pH of 4-6 was found to be reproducible polarograms by use of D.C. polarograph. However, in alkali solvents the plateau of elemental sulfur has a pronounced dip if the concentration of sulfur is as much as 30ppm. (2) A.C. polarographic method shows a very high sensitivity in the case of sulfur reduction, so that the very low concentration of sulfur can easily be determined (about 1ppm). (3) The characteristics of sulfur wave can be formulated according to Stackelberg-Hauck-Hans equation. It was found that the curve of the peak potential of elemental sulfur in A.C. polarography versus logarithm of sulfur concentration was obtained to be straight line with the slope of 29.6 millivolts. This result was well agreed with theoretical consideration. (4) It was assumed that this polarographical methods were applicable to micro-analysis of elemental sulfur in crude oil and its petrochemical products, precipitated sulfur, and sulfur ointments with accuracy and rapidity.

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The Effects of Sulfur extract on Anti-Inflammation and Anti-Propionibacterium acnes (유황(硫黃)이 여드름 유발균과 염증에 미치는 영향)

  • Lee, Seon-Yong;Seo, Hyeong-Sik
    • The Journal of Korean Medicine Ophthalmology and Otolaryngology and Dermatology
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    • v.20 no.2
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    • pp.68-76
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    • 2007
  • Objectives : This experimental study was performed to investigate the effects of Sulfur extract on anti-inflammation and anti-Propionibacterium acnes. Methods : The cytotoxicity of Sulfur extract about viability of Raw 264.7 cell were tested using a colorimetric tetrazolium assay(MTT assay). To investigate the anti-inflammation effects of Sulfur extract on LPS-induced macrophage Raw 264.7 cell, we used ELISA kit and Western blots. We evaluated anti-oxidation effects of Sulfur extract on HaCaT cell by Enzyme recycling method. And we investigated the inhibitory effects of Sulfur extract on Propionibactrium acnes using paper disk diffusion method. Results: 1. Sulfur extract has a little cytotoxicity in Raw 264.7 cell. 2. Concentration of $100\;{\mu}g/m{\ell}$ Sulfur extract inhibited the production of NO in the Raw 264.7 cell stimulated with LPS. 3. Sulfur extract showed a oxidation inhibition effect by decreasing the DPPH radicals. 4. Sulfur extract has not the significant inhibition effect of Propionibactrium acnes. Conclusions: These results indicate that Sulfur extract has anti-inflammation and anti-oxidation effects. If further study is performed, the use of Sulfur extract will be valuable and benificial in the therapy of Propionibactrium acnes.

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Characterization of Sulfur Oxidation by an Autotrophic Sulfur Oxidizer, Thiobacillus sp. ASWW-2

  • Lee Eun Yaung;Cho Kyung-Suk;Ryu Hee Wook
    • Biotechnology and Bioprocess Engineering:BBE
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    • v.5 no.1
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    • pp.48-52
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    • 2000
  • An autotrophic sulfur oxidizer, Thiobacillus sp. ASWW-2, was isolated from activated sludge, and its sulfur oxidation activity was characterized. Thiobacillus sp. ASWW-2 could oxidize elemental sulfur on the broad range from pH 2 to 8. When 5-50 g/L of elemental sulfur was supplemented as a substrate, the growth and sulfur oxidation activity of Thiobacillus sp. ASWW-2 was not inhibited. The specific sulfur oxidation rate of strain ASWW-2 decreased gradually until sulfate was accumulated in medium up to 10 g/L. In the range of sulfate concentration from 10 g/L to 50 g/L, the sulfur oxidation rate could keep over $2.0g-S/g-DCW{\cdot}d$. It indicated that Thiobacillus sp. ASWW-2 has tolerance to high concentration of sulfate.

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Study on the Sulfide Corrosion to the Internal Surface of Transportation Pipeline

  • Zhang, Yiling;Qi, Ping;Kong, Dehong
    • Corrosion Science and Technology
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    • v.7 no.4
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    • pp.193-196
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    • 2008
  • This article briefly tests and analyzes the sulfur content and the distribution of active sulfur in the crude oil of Kurkow Kazakhstan and Siberian Russian, and discusses the relationship between active sulfur content and total sulfur content, active sulfur and corrosion. At the same time, it measures the open circuit potential of X70 steel and X60 steel witch have been immerged in the above two kind of crude oil for a period of time, discusses the sulfur corrosion to metal.

The Exchange of Reduced Sulfur Gases Across the Atmosphere-Teerrestrial Biosphere Interface

  • Kim, Ki-Hyun;Zhen Yand;Shiming Wang
    • Journal of Korean Society for Atmospheric Environment
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    • v.12 no.E
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    • pp.1-18
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    • 1996
  • In this review, the significance of terrestrial ecosystems in the global sulfur budget has been reviewed based on the currently available databases covering the topic. In the section 1, we describe our current understanding of natural sulfur cycle in relation to most well-known natural reservoir, oceanic environment. The sections 2 and 3 provide the fundamental pictures of the rerrestrial sulfur cycle with respect to the relative importance of its individe the fundamental pictures of the terrestrial sulfur cycle with respect to the section 3, previously reported flux values for several major sulfur gases are presented for each reservoir and are intercompared to derive representative fluxes for the respective environment. In the section 4, source mechanisms for volatile sulfur species are dealt for both microscale and macroscale processes leading to their productions. In the section 5, environmental factors controlling the exchange of biogenic sulfur gases across the air-surface have been discussed. In the section 6, environmental fate of sulfur gases released into the atmosphere has been described. Finally in tie section 7, as concluding remarksm we discuss directions and suggestions to overcome various limitations encountered from previous measurement investigations of natural sulfur cycle in diverse natural ecological systems.

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Effect of Carbon Content of Sulfur Electrode on the Electrochemical Properties of Lithium/Sulfur Battery Using PEO Electrolyte (유황전극의 탄소량 변화에 따른 리튬/유황 전지의 방전특성 변화)

  • Kang, K.Y.;Ryu, H.S.;Kim, J.S.;Kim, K.W.;Ahn, J.H.;Lee, G.H.;Ahn, H.J.
    • Transactions of the Korean hydrogen and new energy society
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    • v.17 no.3
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    • pp.317-323
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    • 2006
  • Electric conductive material should be homogeneously mixed with sulfur in sulfur electrode fabrication of lithium/sulfur battery, because sulfur is electric insulator. In this paper electrochemical properties of Li/S battery was studied with various compositions of sulfur electrodes. When content of sulfur changed from 40 wt.% to 80 wt.%, the 60 wt.% sulfur electrode showed the maximum capacity of 1489 mAh/g-sulfur. Electrochemical properties of Li/S battery using 60 wt.% sulfur was also investigated with various carbon contents. The discharge capacity changed as a function of carbon contents. The optimum composition was 25 wt.% carbon for 60 wt.% sulfur electrode.

Effects of Sulfur Fertilizer on the Expression of 11S and 7S Seed Storage Proteins of Soybean

  • El-Shemy Hany A.;Nguyen Nguyen Tran;Ahmed Sherif H.;Fujita Kounosuke
    • Journal of Plant Biotechnology
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    • v.8 no.1
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    • pp.1-8
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    • 2006
  • The differential response of soybean cultivars with or without sulfur (S) application was observed under fold conditions. Plant biomass decreased by sulfur deficiency but the reduction was less in Bragg variety about 26 % relative to the control than other ones over 45%, probably due to less reduction in loaves and pods. The photosynthetic rate of Bragg cultivar was also unaffected by the absence of sulfur application while it depressed in other lines. Soybean cultivars were compared in terms of storage protein, protein quality and biomass production by application of sulfur nutrition. The storage protein concentration tended to decrease without sulfur application in all the cultivars, however the differential response of protein quality only by 11S/7S ratio to sulfur nutrition status was observed: For instance, Bragg cultivar had higher biomass and protein production but protein quality decreased at sulfur deficiency. On the other hand, biomass and protein production in other cultivars remained louver at sulfur deficiency but protein quality differed genetically in spite of sulfur nutrition status. These results suggest that the response of soybean to sulfur nutrition is controlled by genotypic difference and sulfur supply status.

Growth Characteristics of Acidithiobacillus thiooxidans in Different Sulfur Concentrations (황 농도에 따른 Acidithiobacillus thiooxidans의 생장 특성)

  • Lee, Eun-Young;Cho, Kyung-Suk;Ryu, Hee-Wook
    • Microbiology and Biotechnology Letters
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    • v.34 no.4
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    • pp.338-341
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    • 2006
  • The growth characteristics of sulfur-oxidizing bacteria, Acidithiobacillus thiooxidans AZ11, MET, and TAS were investigated in mineral salt media supplemented with elemental sulfur of 1$\sim$50 g $L^{-1}$. The sulfur oxidation rates of A. thiooxidans. MET and TAS increased highly with increasing sulfur concentration up to 10 g L$^{-1}$, but the rates increased slowly in sulfur concentration over 10 g L$^{-1}$. A. thiooxidans AZ11 showed the parallel increase of sulfur oxidation rate until sulfur concentration increased up to 40 g L$^{-1}$. The maximum sulfur oxidation rates (V$_{max}$) of AZl1, MET and TAS were 1.88, 1.38 and 0.43 g S L$^{-1}$ d$^{-1}$, respectively. The maximum specific growth rates (${\mu}_{max}$) of AZ11, MET, and TAS were 0.33 d$^{-1}$, 0.30 d$^{-1}$ and 0.45 d$^{-1}$, respectively. Although MET and TAS couldn't grow at sulfate concentration of 40 g L$^{-1}$, AZ11 could grow in the presence of 58 g L$^{-1}$ sulfate, the final oxidation product of elemental sulfur.

Study on the Suppression of Sulfur Trioxide in High Sulfur Boiler (고유황 보일러에서의 Sulfur Trioxide의 억제에 대한 연구)

  • Choi, Sung-Bu
    • Journal of the Korean Applied Science and Technology
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    • v.28 no.4
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    • pp.455-463
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    • 2011
  • The average sulfur content of crude oil is 2.2%. Coal is about 0.3 to 4.0 percent of the sulfur gases or particles being discharged into the atmosphere through the chimney as 1 to 2% $SO_3$(Sulfur trioxide) and about 95% of the $SO_2$ is reported. $SO_3$ gas, which has many different causes of, as the combustion of sulfur containing fuel during the air due to the excess $SO_2$ gas is oxidized to $SO_3$ gas. Sulfur trioxide emitted from high sulfur heavy oil fired boiler caused white plume in stack and high temperature and cold end corrosion of facilities. So, in order to control sulfur trioxide concentration of Fuel gas in boiler, various of additives are used in other foreign. They are injected to Fuel Oil and consumed in boiler and reduce ash and the conversion rate of sulfur trioxide. In domestic, MgO compounds are used as additives but the total volume of them are made from other foreign company. In this study, MgO compounds were developed with liquid MgO compounds and field application was accomplished. The effect of newly developed chemicals and process were nearly equal to foreign products. In Consequent, the chemicals and process produced by newly developed technology can be substituted for foreign products and reduce the cost of plant operation.